#region License
// MultiplyConverter.cs
// 
// Copyright (c) 2012 Xoqal.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion

namespace Xoqal.Presentation.Converters
{
    using System;
    using System.Globalization;
    using System.Windows.Data;

    /// <summary>
    /// Multiply Converter
    /// </summary>
    public class MultiplyConverter : IMultiValueConverter
    {
        #region IMultiValueConverter Members

        /// <summary>
        /// Converts source values to a value for the binding target. The data binding engine calls this method when it propagates the values from source bindings to the binding target.
        /// </summary>
        /// <param name="values"> The array of values that the source bindings in the <see
        ///  cref="T:System.Windows.Data.MultiBinding" /> produces. The value <see
        ///  cref="F:System.Windows.DependencyProperty.UnsetValue" /> indicates that the source binding has no value to provide for conversion. </param>
        /// <param name="targetType"> The type of the binding target property. </param>
        /// <param name="parameter"> The converter parameter to use. </param>
        /// <param name="culture"> The culture to use in the converter. </param>
        /// <returns> A converted value.If the method returns null, the valid null value is used.A return value of <see
        ///  cref="T:System.Windows.DependencyProperty" /> . <see cref="F:System.Windows.DependencyProperty.UnsetValue" /> indicates that the converter did not produce a value, and that the binding will use the <see
        ///  cref="P:System.Windows.Data.BindingBase.FallbackValue" /> if it is available, or else will use the default value.A return value of <see
        ///  cref="T:System.Windows.Data.Binding" /> . <see cref="F:System.Windows.Data.Binding.DoNothing" /> indicates that the binding does not transfer the value or use the <see
        ///  cref="P:System.Windows.Data.BindingBase.FallbackValue" /> or the default value. </returns>
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            double result = 1.0;
            for (int i = 0; i < values.Length; i++)
            {
                if (values[i] is double)
                {
                    result *= (double)values[i];
                }
            }

            return result;
        }

        /// <summary>
        /// Converts a binding target value to the source binding values.
        /// </summary>
        /// <param name="value"> The value that the binding target produces. </param>
        /// <param name="targetTypes"> The array of types to convert to. The array length indicates the number and types of values that are suggested for the method to return. </param>
        /// <param name="parameter"> The converter parameter to use. </param>
        /// <param name="culture"> The culture to use in the converter. </param>
        /// <returns> An array of values that have been converted from the target value back to the source values. </returns>
        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new Exception("Not implemented");
        }

        #endregion
    }
}
